单项选择题

America's first backbone Internet Service provider was ______.

A．EarthLink
B．MCI
C．GTE Corp
D．NSFNET
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单项选择题
Which of the following is NOT a cause of the problem under discussion
A．Over-grazing.
B．Radioactive contamination.
C．Poaching.
D．Tramplin
单项选择题
Ernest Hemingway's first book was published in______.
A．1923
B．1924
C．1926
D．1929
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